添加抑制劑對鋁合金燃料電池於KOH電解液中之耐蝕性質評估

The corrosion property of anode in aluminum alloy fuel cell with the addition of inhibitor in KOH electrolyte

本研究主要針對鋁合金燃料電池中的陽極採用1050系列及6061系列，探討電池性能；電解溶液以氫氧化鉀（KOH）為主，在添加不同分子量的聚乙二醇600 （PEG600）、聚乙二醇1000 （PEG1000）抑制劑，進行不同電化學測試，探討1050系列及6061系列的鋁材在電解液中的腐蝕效能，發現在純KOH電解液進行定電流測試，1050鋁合金電導率優於6061鋁合金。而抑制劑則可以由極化曲線得知濃度在3.0wt%時，PEG1000比PEG600有較高的腐蝕電位與較小的腐蝕電流密度，顯示PEG1000有最細密分子，具有良好抑制效果。

The performances of aluminum alloy fuel cells incorporating 1050 and 6061 aluminum alloy anodes were mainly investigated in this study. The electrolyte adopted in the fuel cell consisted of potassium hydroxide (KOH) and two different polyethylene glycol (PEG) inhibitors- PEG600 and PEG1000, respectively. With different electrochemical measurements, the electrical output performance of Al1050 was better than its Al6061 counterpart in pure KOH electrolyte without inhibitor. With the addition of 3 wt% of inhibitor, the aluminum alloy in electrolyte with PEG1000 showed higher corrosion potential and lower corrosion current than with PEG600. The result confirmed the PEG1000 inhibitor having denser molecule compaction exhibits better corrosion suppression.